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Re: [AVTCORE] [MMUSIC] draft-hsyang-avtcore-rtp-haptics-02: Needs to register "haptics" as an SDP <media>

Dan Wing <danwing@gmail.com> Thu, 04 April 2024 14:53 UTC

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From: Dan Wing <danwing@gmail.com>
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Date: Thu, 04 Apr 2024 07:53:26 -0700
Cc: Christer Holmberg <christer.holmberg=40ericsson.com@dmarc.ietf.org>, Jonathan Lennox <jonathan.lennox@8x8.com>, Hyunsik Yang <Hyunsik.Yang=40InterDigital.com@dmarc.ietf.org>, IETF AVTCore WG <avt@ietf.org>, "draft-hsyang-avtcore-rtp-haptics@ietf.org" <draft-hsyang-avtcore-rtp-haptics@ietf.org>, "mmusic@ietf.org" <mmusic@ietf.org>, Xavier De Foy <Xavier.DeFoy@interdigital.com>
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To: Christer Holmberg <christer.holmberg@ericsson.com>
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Subject: Re: [AVTCORE] [MMUSIC] draft-hsyang-avtcore-rtp-haptics-02: Needs to register "haptics" as an SDP <media>
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On Apr 4, 2024, at 7:05 AM, Christer Holmberg <christer.holmberg@ericsson.com> wrote:
> 
> Hi,
> 
>>> The document making "haptics" a new top-level media type, coming out of the mediaman WG, has IETF
>>> consensus (see https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-ietf-mediaman-haptics%2F&data=05%7C02%7Cchrister.holmberg%>>40ericsson.com%7C99eed9a7a0a34423d63008dc54359e43%7C92e84cebfbfd47abbe52080c6b87953f%7C0%7C0%7C638477836493194978%7CUnknown%>>7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=HO9dSL4UL6PTobV0xs%2F2Sr2s%2FnYTB3MJ4jfn%2BN0lEJ4%>>3D&reserved=0).
>>> 
>>> Since RTP payload types follow media types, I don't think that decision needs be revisited here for SDP specifically.
>>> 
>>> RFC 8866 (SDP) says:
>>> 
>>> “The set of media types is intended to be small and SHOULD NOT be extended except under rare circumstances.”
>>> 
>>> Why is “haptics” considered a rare circumstance?
>> 
>> It is one of the 5 senses,
>> 
>> sight = media type video
>> hearing = media type audio
>> touch = media type haptics
>> smell = (undefined)
>> taste = (undefined)
> 
> Ok. Maybe that should be made more clear. That's not how I read the why-not-use-application justification in draft-ietf-mediaman-haptics.
> 
> I think it needs to be clearly justified why a new top-level type is accepted in this case, to avoid a slippery slope of new types.

Agreed.  I view this as a more straightforward argument than current justification text.

-d

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